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<strong>GKSJ雙鉗多功能接地電阻測(cè)試儀</strong></strong>是一種手持式的接地測(cè)量?jī)x。儀器配備有測(cè)試所必需的附件。操作簡(jiǎn)單、直觀，操作者只需要閱讀說(shuō)明書(shū)而不必參加專(zhuān)門(mén)的培訓(xùn)就能夠操作。</p><p><strong>GKSJ雙鉗多功能接地電阻測(cè)試儀</strong><strong>產(chǎn)品特點(diǎn)：</strong></p><p style="margin-left:24pt">1、雙鉗法/地樁法雙重測(cè)量方式：</p><p style="margin-left:24pt"> 適合任意接地場(chǎng)所，多點(diǎn)或單點(diǎn)接地，都可正常測(cè)試；</p><p style="margin-left:24pt">2、抗干擾能力強(qiáng)：</p><p style="margin-left:24pt"> 自產(chǎn)生高頻電流，從而過(guò)濾市電中50Hz、100Hz等諧波干擾電流，即使在500KV變電站環(huán)境下，也能測(cè)量；</p><p style="margin-left:24pt">3、測(cè)量范圍廣、分辨率高：</p><p style="margin-left:24pt"> 量程從0.01Ω～200Ω，分辨率0.01Ω，對(duì)0.7Ω以下接地電阻，也能準(zhǔn)確測(cè)量；</p><p style="margin-left:24pt">4、大鉗口設(shè)計(jì)：</p><p style="margin-left:24pt"> 鉗口直徑50mm（標(biāo)準(zhǔn)配置），滿足用扁鐵/鋼作接地引線的情況，特殊鉗口尺寸可按客戶要求定制；</p><p><strong>技術(shù)參數(shù)：</strong></p><p>1、接地電阻測(cè)量范圍：</p><p>雙鉗法：0.01Ω～200Ω</p><p>地樁法：0.01Ω～200Ω</p><p>2、準(zhǔn)確度:</p><p>雙鉗法：±3%±2個(gè)字</p><p>地樁法：±2%±2個(gè)字</p><p>3、zui小分辨率：0.01Ω</p><p>4、鉗口尺寸：Φ50mm</p><p>5、存儲(chǔ)容量：200組數(shù)據(jù)</p><p>6、工作溫度：0ºC ～+ 50°C</p><p>7、供電方式：8節(jié)5號(hào)鎳氫充電電池或普通AA電池</p><p>8、重量：0.8kg(含電池)</p><p>9、尺寸：265×130×65mm<sup>3</sup></p><p> </p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">測(cè)量原理及使用方法</span></strong></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈠、雙鉗法</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">1、測(cè)量原理</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">此方法的優(yōu)點(diǎn)在于：一是操作簡(jiǎn)單。可以在不斷開(kāi)待測(cè)設(shè)備電源，在其正常工作時(shí)進(jìn)行測(cè)試，不必插入測(cè)量探頭，也不必將被測(cè)電極分開(kāi)，只需要雙鉗夾著接地導(dǎo)體就可以測(cè)出其接地電阻。二是精度高。其精度可以達(dá)到0.01Ω。三是抗干擾能力強(qiáng)?？梢詾V出各種工頻諧波。四是可以作為打地樁方式的補(bǔ)充。在很多條件下（如房屋密集或鋪滿水泥的地區(qū)），很難甚至不可能采用打樁的方式對(duì)接地電阻的測(cè)量，使用雙鉗口測(cè)試原理，可以不用打接地樁進(jìn)行測(cè)量。該測(cè)量原理的WEI一的不足是：不能夠直接對(duì)單點(diǎn)接地系統(tǒng)的測(cè)量。在單點(diǎn)接地系統(tǒng)中應(yīng)慎用鉗形地阻表。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">其測(cè)量原理簡(jiǎn)述如下：本儀表配有兩個(gè)鉗口：電壓鉗和電流鉗。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">如圖2所示，電壓鉗在被測(cè)回路中激勵(lì)出一個(gè)感應(yīng)電勢(shì)E，并在被測(cè)回路產(chǎn)生電流I，儀表通過(guò)電流鉗可以測(cè)得I值。通過(guò)對(duì)E、I的測(cè)量，由歐姆定律：R=E/I，即可求得R的值。</span></span></p><p style="text-align:center"><span style="font-size:16px"><img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb4de6831af7a1ef591bd5f0d7294bc4ed7a032c44f0eb9f397.png" style="height:148px; width:141px" /> </span></p><p style="margin-left:17.95pt; text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖2 測(cè)量原理</span></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">2、多極并聯(lián)接地電阻的測(cè)量</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">對(duì)多點(diǎn)接地系統(tǒng)（例如輸電系統(tǒng)桿塔接地、通信電纜接地系統(tǒng)、某些建筑物等），它們通過(guò)架空地線（通信電纜的屏蔽層）連接，組成了接地系統(tǒng)。如圖3所示：</span></span></p><p style="text-align:center"><span style="font-size:16px"><img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb45335730fe093aa95b853af58a73c75abcea41485db3b3494.png" style="height:243px; width:516px" /> </span></p><p style="text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖3 多點(diǎn)接地系統(tǒng)地阻的測(cè)量</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">當(dāng)用鉗表將兩個(gè)鉗口鉗入被測(cè)接地線上，兩個(gè)鉗口的間距為30cm左右，發(fā)射鉗夾插入“發(fā)射”航插孔，接收鉗夾插入“接收”航插孔，兩航插孔不可互換，（如上圖測(cè)量時(shí)），其等效電路見(jiàn)下圖。</span></span></p><p style="margin-left:6pt; text-align:center"><span style="font-size:16px"><img alt="" src="https://img49.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb423495193c73985245118d7288a08c3fbe1e62fad01e86b37.png" style="height:148px; width:141px" /> </span></p><p style="text-align:center"><span style="font-size:16px"><span style="font-family:宋體">圖4 等效電路</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">則R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體"> =Rx+ R</span><sub><span style="font-family:宋體">0</span></sub></span></p><p><span style="font-size:16px"><span style="font-family:宋體">其中：</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體">：儀表測(cè)量出的值</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">Rx：待測(cè)接地電阻</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">：所有其它桿塔的接地電阻并聯(lián)后的等效電阻。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">雖然，從嚴(yán)格的接地理論來(lái)說(shuō)，由于有所謂的“互電阻”的存在，R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">并不是通常的電工學(xué)意義上的并聯(lián)值（它會(huì)比電工學(xué)意義上的并聯(lián)值稍大），但是，由于每一個(gè)桿塔的接地半球比起桿塔之間的距離要小得多，而且畢竟接地點(diǎn)數(shù)量很大，R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">要比R</span><sub><span style="font-family:宋體">1</span></sub><span style="font-family:宋體">小得多。因此，可以從工程角度有理由地假設(shè)R</span><sub><span style="font-family:宋體">0</span></sub><span style="font-family:宋體">=0。這樣，我們所測(cè)的電阻就應(yīng)該是R</span><sub><span style="font-family:宋體">X</span></sub><span style="font-family:宋體">了，即R</span><sub><span style="font-family:宋體">T</span></sub><span style="font-family:宋體">≈Rx。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">多次不同環(huán)境、不同場(chǎng)合下與傳統(tǒng)方法進(jìn)行對(duì)比試驗(yàn)，證明上述假設(shè)是*合理的。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><span style="font-family:宋體">非接觸測(cè)量法（即雙鉗法）是一種*的測(cè)量技術(shù)，具有諸多優(yōu)點(diǎn)。不過(guò)，測(cè)試儀測(cè)得的電阻是包括被測(cè)接地電阻在內(nèi)的整個(gè)回路的電阻。使用中必須牢記這一點(diǎn)，以利對(duì)測(cè)量結(jié)果的分析。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">注意：發(fā)射鉗夾，接收鉗夾不可互換。</span></strong></span></p><p><span style="font-size:16px"><strong><span style="font-family:宋體">3、雙鉗法測(cè)獨(dú)立接地體的方法</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">a、雙鉗法在測(cè)試過(guò)程中，一定要有一個(gè)有效的閉合回路。解決的辦法是找一個(gè)輔助接電極，將被測(cè)接地體與接地良好的輔助地（如自來(lái)水管等）用連接線連在一起，將二個(gè)鉗口鉗入連接線上，（圖5所示）：二者間距30cm左右，此時(shí)按“雙鉗”鍵，進(jìn)行雙鉗法測(cè)量界面，再按“測(cè)試”鍵直接顯示測(cè)量結(jié)果。測(cè)試獨(dú)立接地體接地電阻時(shí)可根據(jù)不同的情況采用不同的測(cè)試方法。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">b、當(dāng)機(jī)房處于低樓層時(shí)（一、二層）可采用地樁測(cè)試方法，直接測(cè)出接地電阻。</span></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><span style="font-family:宋體">機(jī)房處于較高樓層時(shí)，（二層以上），可采用“獨(dú)立接地體”測(cè)試方法此種方法是基于將自來(lái)水管網(wǎng)的接地電阻理論上認(rèn)為是零歐姆，但實(shí)際上是有電阻值的，此時(shí)測(cè)試分為二步：*步，按“獨(dú)立接地體”測(cè)試方法測(cè)出R</span><sub><span style="font-family:宋體">A</span></sub><span style="font-family:宋體">；第二步，單獨(dú)在一樓將自來(lái)水管的接地電阻按“地樁”測(cè)試方法測(cè)出R</span><sub><span style="font-family:宋體">B</span></sub><span style="font-family:宋體">（此時(shí)自來(lái)水管看作獨(dú)立接地體），（R</span><sub><span style="font-family:宋體">A</span></sub><span style="font-family:宋體">－R</span><sub><span style="font-family:宋體">B</span></sub><span style="font-family:宋體">）即為機(jī)房接地裝置的實(shí)際接地電阻?！?/span></span></li></ul><p style="margin-left:27pt; text-align:center"><span style="font-size:16px"><img alt="" src="https://img48.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb4373f7e9cef1cba05f3b8507d2b9543452e969ad9a8cf7572.png" style="height:153px; width:372px" /><br /><span style="font-family:宋體">圖5 獨(dú)立接地體地阻測(cè)量</span></span></p><ul style="list-style-type:square"><li><span style="font-size:16px"><span style="font-family:宋體">雙鉗法測(cè)電阻時(shí)，如果測(cè)量值顯示溢出，則說(shuō)明被測(cè)電阻已超過(guò)本儀表的測(cè)量范圍或說(shuō)明鉗口沒(méi)有鉗繞任何金屬導(dǎo)體或被測(cè)接地線。</span></span></li></ul><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈡、地樁法</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">采用圖6的連接方法。此時(shí)按“地樁”鍵，進(jìn)入地樁法測(cè)試界面。再按“測(cè)試”鍵可更精確地測(cè)量出被測(cè)接地體的接地電阻值。</span></span></p><p style="margin-left:27pt; text-align:center"><span style="font-size:16px"> <img alt="" src="https://img47.chem17.com/gxhpic_22d2937a21/4c6de04c44fd79c383f5fd3661213eb45cf720bb3fcfed81a4f4b55e0d7f4080e9b31bd3c832a77f.png" style="height:274px; width:383px" /></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈢、存儲(chǔ)</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">每次測(cè)量后，可存貯測(cè)量結(jié)果。按左移鍵或右移鍵，將光標(biāo)停在“存儲(chǔ)”上，按“確認(rèn)”鍵進(jìn)入存儲(chǔ)功能。輸入要存儲(chǔ)或查看的目號(hào)，然后按“確認(rèn)”即可存儲(chǔ)，例如要將測(cè)量數(shù)據(jù)存儲(chǔ)到第7組內(nèi)，則將目號(hào)調(diào)整至007。再按“確認(rèn)”鍵，進(jìn)行確認(rèn)，即可完成存儲(chǔ)。如該目號(hào)已存有數(shù)據(jù)，則原數(shù)據(jù)被覆蓋。繼續(xù)測(cè)試，按“確認(rèn)”鍵，返回測(cè)試狀態(tài)。本機(jī)可存儲(chǔ)200組數(shù)據(jù)。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈣、查看/刪除</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">在雙鉗法和地樁法測(cè)試界面，將光標(biāo)移到“返回”上，再按“確認(rèn)”鍵，即右進(jìn)入主菜單，再按“▲”“▼”鍵，選擇 “查看歷史數(shù)據(jù)”或“刪除歷史數(shù)據(jù)”。再按“確認(rèn)”鍵，進(jìn)入相應(yīng)的功能。按“</span><img src="file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml\wps2A99.tmp.png" style="height:16px; width:13px" /><span style="font-family:宋體">” “</span><img src="file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml\wps2A9A.tmp.png" style="height:16px; width:13px" /><span style="font-family:宋體">”左右調(diào)整，按“▲” 、“▼”調(diào)整數(shù)字，按“確認(rèn)”鍵進(jìn)行確認(rèn)，即可查閱存儲(chǔ)數(shù)值或刪除存儲(chǔ)的數(shù)值。</span></span></p><p style="margin-left:6pt"><span style="font-size:16px"><strong><span style="font-family:宋體">㈤、保持</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">在雙鉗法，地樁法測(cè)試過(guò)程中，由于環(huán)境影響及外界干擾等因素，可能會(huì)出現(xiàn)數(shù)值不穩(wěn)定的現(xiàn)象。在雙鉗法、地樁法測(cè)試界面，當(dāng)光標(biāo)停留在“保持”上時(shí)可以按“確認(rèn)”鍵對(duì)測(cè)量數(shù)值進(jìn)行鎖定，便于測(cè)量者進(jìn)行記錄和讀取數(shù)值。此時(shí)屏幕上“保持”變?yōu)?ldquo;解除”，再按一下“確認(rèn)”即可解除鎖定功能。</span></span></p><p> </p><p><span style="font-size:16px"><strong><span style="font-family:宋體">七、注意事項(xiàng)</span></strong></span></p><p><span style="font-size:16px"><span style="font-family:宋體">1、鉗口和主機(jī)為配套使用，出廠前已按要求配好。為避免測(cè)量誤差，本主機(jī)所配鉗口不得用于其他主機(jī)上。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">2、任何時(shí)候都要保護(hù)鉗口鐵芯接觸面的清潔，被污染的鉗口會(huì)降低儀表的測(cè)量準(zhǔn)確度。</span></span></p><p><span style="font-size:16px"><span style="font-family:宋體">3、測(cè)試時(shí)，要保持鉗口閉合良好，不可出現(xiàn)卡殼現(xiàn)象。</span></span></p> <div id="ag0icou4w4" class="pagetb"> <p> 上一條：<a href="/Products-27529891.html">HT5600雙鉗多功能接地電阻測(cè)試儀</a></p> <p> 下一條：<a 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